TWI783695B - Method for switching video receiving interface and circuit system - Google Patents

Abstract

A method for switching video receiving interface and a circuit system are provided. The circuit system is disposed in a sink device. A protocol layer circuit of each of video receiving interfaces in the sink device includes a status and control data channel control module, which is used to respond to the signals transmitted by the video sources constantly when the sink device connects with video sources via the video receiving interfaces. The multiple video sources can accordingly send fixed rate link signals to the sink device in response to the responses made by the sink device. The protocol layer circuit includes a fixed rate link video packet detection module that starts to detect a rate of a fixed rate link and analyze video packets for acquiring video data when the sink device switches to the video receiving interface.

Description

Method and circuit system for switching audio-visual receiving interface

The manual proposes a system for playing audio and video, especially the method and circuit system that can save time spent playing audio and video after switching audio and video ports by modifying the firmware to avoid stopping the link training.

In response to different interface requirements in the consumer market, displays often have multiple image receiving interfaces. For example, it is common to have different numbers of Display Ports (Display Port) and High-Definition Multimedia Interface (High-Definition Multimedia Interface, HDMI) in one display device. and other image receiving interfaces, so that users can use the same monitor to switch between different interfaces to receive image data from different interfaces; or have multiple receiving ports in one interface, allowing users to switch between different receiving ports to receive Image data of the same interface from different sources.

For example, FIG. 1 can be referred to to show a schematic diagram of the structure of a conventional display adopting a high-definition multimedia interface and a display port. The operation process can be referred to in FIG.

Figure 1 shows a storage device (sink) 10, which is an electronic device that broadcasts audio-visual content in order to receive audio-visual content, such as a TV or a monitor (Monitor). The circuit of the image receiving interface is shown in the figure. In this example The storage terminal device 10 is provided with two high-definition multimedia interfaces, such as HDMI port A (111) and HDMI port B (112) as shown, and a display port (Display Port) 113, HDMI port A (111), HDMI port A (111), HDMI Port B (112) and display port 113 have their own power circuits in the storage device 10, such as the power domains (power domains) 101, 102 and 103 shown in the figure. The design of the power domains 101, 102 and 103 is independent of The power domain of the main circuit (not shown in this figure) in the storage terminal device 10 .

This example shows that HDMI port A (111), HDMI port B (112) and display port 113 are respectively connected to video source A (11), video source B (12) and video source C through their respective video signal cables 121, 122 and 123 (13), as shown in step S201 of FIG. 2 , establish connections between each video receiving interface and video and audio sources, and switch to receive one of the audio and video sources according to the operation of the storage device 10 by the user. In this example, when the user is playing the audio-visual content received from the audio-visual source C (13) through the display port 113, as shown in step S203, the user plays the audio-visual content from a certain source (in this example, the audio-visual source C (13)) content, at this time the other two image receiving interfaces have the following two situations.

One of the situations is that in order to reduce the power consumption of the storage device 10, the main circuits of the power domains 101 and 102 can be powered off, so even if the audio and video signal lines of each interface are connected, because the power domains 101 and 102 have been disconnected. Therefore, the computer cannot establish a data transmission channel (data transmission channel) with video source A (11) and video source B (12) through link training (Link Training). At this time, because the link training cannot be successful, the audio-visual source A (11) and the audio-visual source B (12) will not send a fixed rate link (Fixed Rate Link, FRL) signal, as shown in step S205 in Figure 2, and other The audio-visual interface that is not playing cannot complete the HDMI link training with the audio-visual source, or cannot continue to respond to the polling of the audio-visual source, so that the audio-visual source stops sending FRL signals until the user connects the currently used display port 113 to its audio-visual interface When the signal cable is switched to audio-visual source A (11) and audio-visual source B (12).

When the user operates the storage terminal device 10 to switch to receive audio and video content from the audio and video source A (11) through the HDMI port A (111), as shown in step S207 in Figure 2, the storage terminal device 10 turns on the power of the corresponding power domain 101, and then Restart the link training between the storage device 10 and the video source A (11) through a hot plug switch to establish a data transmission channel, and start the HDMI hot plug switch as shown in step S209 in Figure 2 to restart Start the link training program, and step S211, the storage terminal device 10 and the video source A (11) start link training, after the link training is successful, establish a fixed rate link in step S213 as shown in Figure 2, and then the video source can be played The video and audio content of A (11), as in step S215.

In another case, even if the audio-visual content provided by the audio-visual source A (11) or the audio-visual source B (12) is not being played at the moment, the storage device 10 keeps the power domains 101 and 102 powered, so when When the HDMI cable (video signal cable 121, 122) is connected to the video source A (11) or video source B (12), the link training can be completed and the data transmission channel can be established. In this way, when the user wants to switch to one of the HDMI video sources, the video source A (11) or the video source B (12), only need to perform the switch without restarting the link training through the hot plug switch (hot plug toggle) program. But in this case, the power domains 101 and 102 are powered all the time, which increases the power consumption.

According to the description of the prior art above, when the user wants to switch from the currently playing audio-visual content to display images received by other audio-visual receiving interfaces, the switching process needs to wait for the switched image receiving interface to re-establish a data transmission channel before starting to receive video material. Such a situation will cause the user to experience bad video and audio viewing when switching between different video receiving interfaces.

Another embodiment is a schematic diagram of a circuit structure of a conventional display using a high-definition multimedia interface as shown in FIG. 3 .

In this example, the storage terminal device 30 is equipped with multiple HDMI interfaces, such as the HDMI port A (301) and HDMI port B (302) shown in the figure, and the audio-visual source A (31) is connected to the audio-visual source A (31) through the audio-visual signal lines 331 and 332 respectively. Source B (32). Each HDMI interface will include a physical layer (physical layer) and a protocol layer (protocol layer). This example shows that the relevant circuits of HDMI port A (301) include HDMI physical layer A (311) and HDMI protocol layer A (321). Related circuits of port B (302) include HDMI physical layer B (312) and HDMI protocol layer B (322). When the fixed-rate link signal enters the HDMI interface, it is first converted into a digital signal by the corresponding physical layer, and then the image data is decoded by the protocol layer. Therefore, when the storage terminal device 30 has multiple HDMI interfaces, it needs to There are multiple HDMI protocol layers, and the HDMI protocol layer is a complex high-speed signal, so the circuit area occupied by multiple protocol layers is quite large.

In view of the delay problem caused by the need to rebuild the data transmission channel when switching different image receiving interfaces in a display in the conventional technology, this disclosure proposes a method and circuit system for switching audio and video receiving interfaces, by modifying a specific version of high-definition multimedia The fixed rate link (Fixed Rate Link, FRL) operation mechanism defined by the interface (such as HDMI 2.1) can save the image display time that the user needs to wait when switching the high-definition multimedia interface, and can be applied to multiple high-definition multimedia interfaces at the same time. The clear multimedia interface shares a set of receiving circuit architecture to achieve the purpose of minimizing the circuit design.

According to an embodiment, the circuit system is a circuit system in a storage terminal device, such as an audio-visual processing chip, wherein each audio-visual receiving interface is provided with a status and control data channel control module for passing a status and control data The channel communicates with the audio-visual source and provides the audio-visual source to poll the information. The main job is to let multiple audio-visual sources judge that the corresponding multiple audio-visual receiving interfaces in the storage device are in continuous operation; a fixed-rate link audio-visual packet detection The module rebuilds the fixed-rate link through steps such as signal detection, fixed-rate link transmission rate judgment, and fixed-rate link packet judgment.

The circuit system implements a method for switching audio-visual receiving interfaces. In the method, when multiple audio-visual sources are connected to multiple audio-visual receiving interfaces in the storage terminal device, each audio-visual receiving interface controls the module continuously through the status and control data channel. Response The status and control data channel communication request sent by the corresponding audio-visual source to the storage terminal device, and then each audio-visual source can continuously send a fixed-rate link signal to the storage terminal device according to the continuous response of the status and control data channel control module . Therefore, when the storage device switches to one of the audio and video receiving interfaces, the fixed rate link audio and video packet detection module can start to detect the transmission rate and packets of the fixed rate link, so that the storage device can be based on a rate The information obtains video and audio data from one of the video and video sources connected to the video and video receiving interface.

Preferably, the information continuously obtained by the plurality of video and audio sources through the corresponding status and control data channel control module includes one or more checkpoints set by the storage terminal device in the status and control data channel control module.

Furthermore, in addition to being connected to an audio-visual interface physical layer and a status and control data channel control module, the multiple audio-visual receiving interfaces in the storage device also share the audio-visual interface protocol layer through a switching circuit.

Further, when the storage terminal device switches to one of the audio-visual receiving interfaces, other audio-visual sources that are not being played continue to communicate with the status and control data channel through the status and control data channel control module of each audio-visual source It is required that each audio-visual source continuously send a fixed-rate link signal according to the continuous response of the storage-end device, so that the storage-end device and each audio-visual source complete link training.

After the transmission rate is obtained by analyzing the audio-visual packet, the circuit system resets the parameters of the audio-visual interface interface and the physical layer of the audio-visual interface in the storage device to obtain audio-visual data through the fixed-rate link.

In order to further understand the features and technical content of the present invention, please refer to the following detailed description and drawings related to the present invention. However, the provided drawings are only for reference and description, and are not intended to limit the present invention.

The implementation of the present invention is described below through specific specific examples, and those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and various modifications and changes can be made to the details in this specification based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are only for simple illustration, and are not drawn according to the actual size, which is stated in advance. The following embodiments will further describe the relevant technical content of the present invention in detail, but the disclosed content is not intended to limit the protection scope of the present invention.

It should be understood that although terms such as "first", "second", and "third" may be used herein to describe various elements or signals, these elements or signals should not be limited by these terms. These terms are mainly used to distinguish one component from another component, or one signal from another signal. In addition, the term "or" used herein may include any one or a combination of more of the associated listed items depending on the actual situation.

The disclosure book proposes a method and circuit system for switching audio-visual receiving interfaces. By modifying the circuit and operation method, it can effectively save the image display time when users switch audio-visual receiving interfaces, and can be applied to multiple high-definition multimedia interfaces at the same time ( HDMI) interface shares a set of receiving circuit architecture to achieve the purpose of minimizing circuit design. The method is applicable to the operation of the fixed rate link (Fixed Rate Link, FRL) interface under HDMI2.1 version.

According to the embodiment proposed in the disclosure document, the structure of the multiple high-definition multimedia interface (HDMI) interfaces sharing a set of receiving circuits can refer to the circuit block embodiment diagram shown in Figure 5, where the key technology is to switch audio and video reception as shown in Figure 4 The flow chart of the embodiment of the interface method, a circuit module 40 is provided in the circuit system of the storage terminal device (sink), especially in the relevant circuit of the audio-visual receiving interface, so as to run the method for switching the audio-visual receiving interface. According to one of the embodiments, the circuit module 40 for running the method may include a status and control data channel (status and control data channel, SCDC) control module 41 and a fixed rate realized by circuit, firmware or matching software. Link (FRL) video and audio packet detection module 42 .

What is mentioned here is that for the application of the fixed rate link (FRL), according to an embodiment, there are five fixed rates of the fixed rate link, such as: 3/6/8/10/12GHz, each video Each receiving interface has a status and control data channel (SCDC). Because each audio and video source may use a different fixed rate, the status and control data channels of different audio and video receiving interfaces cannot be shared. In the method proposed in the publication, the storage device keeps responding so that the audio-visual source continues to send a fixed-rate link signal, which allows the user to switch to a specific audio-visual source by detecting the fixed-rate link signal and analyzing the audio-visual packet. Play the video again.

According to the embodiment, in order to realize the method for switching audio-visual receiving interface proposed in the publication, modify the circuit system in the storage terminal device, including modifying the firmware of the status and control data channel control module, so that it can provide corresponding audio-visual sources Continuous polling (polling) the information in it, so that the audio-visual source can judge that the corresponding audio-visual receiving interface in the storage device is in continuous operation, and will continue to send information (such as FRL signal) to the storage device, so that when switching audio-visual When receiving the interface, it can directly detect the fixed rate link (FRL) signal, and then start receiving audio and video data, successfully reducing the time spent when switching the audio and video receiving interface.

When an audio-visual signal cable is used to connect the HDMI interface in the sink device and the audio-video source (source), such as a network audio-visual platform, the state of the sink device and the control data channel control module 41 pass a state Communicate with the control data channel (SCDC) and audio and video sources, and start the fixed rate link training (FRL link training) mechanism after the handshake is completed. In the link training process, the storage device has one or more checkpoints (LTP and GAP signals shown in Figure 6) to determine whether the fixed-rate link signal sent by the video source is correct. Reply unconditionally the message that the video source is correct (source pass), so that the link training program can complete the process, and let the video source send a fixed-rate link signal. The process implementation is shown in Figure 6. During the process, the storage device continues to respond to the status and control data channel (SCDC) communication request from the video source, so that the video source can continue to send a fixed-rate link signal, so that the storage device continues to receive video data. What is mentioned here is that the status and control data channel in the circuit module 40 is communicated with the status and control data channel processed by the control module 41 as a low-speed signal, so the increased power consumption for maintaining the status and the operation of the control data channel is very large. small.

When the user operates the remote control to control the storage device and switches from the original playback interface to the HDMI interface to receive related audio-visual data, since the audio-visual source has continuously sent fixed-rate link signals, the video-audio packet detection through the fixed-rate link The detection module 42 can identify the signals online in the energy-saving mode of the relevant audio-visual processing chip, such as a kind of gap packet (Gap Packets), and the fixed-rate link audio-visual packet detection module 42 is also a low-power consumption mechanism. Steps such as determining the transmission rate of the fixed rate link and determining the packet of the fixed rate link are to rebuild the fixed rate link, and start playing the video after receiving the image data.

According to the flow chart of an embodiment of the method for switching audio-visual receiving interfaces shown in FIG. 4 , at the beginning, such as step S401, a plurality of audio-visual receiving interfaces of the storage terminal device are established to connect multiple audio-visual sources, and then in step S403, The user uses the remote control to control the storage terminal device to play the audio-visual content of a certain source. At this time, as in step S405, other audio-visual sources that are not being played by the user can continue to respond through the status and control data channel (SCDC) control module 41 The status and control data channel (SCDC) communication request sent by the audio-visual source, that is, the continuous response to the polling of the audio-visual source, allows the audio-visual source to continuously send a fixed-rate link (FRL) signal according to the continuous response of the storage device. Make the storage end device complete the link training with the audio and video source.

Until step S407 when the user wants to switch the audio-visual receiving interface, in step S409, the fixed-rate link video-audio packet detection module 42 in the circuit module 40 starts to detect the transmission rate of the fixed-rate link, and the received accumulation The terminal device analyzes the video and audio packets. After analyzing the packets, the transmission rate in the audio and video data, or the video and audio resolution and other information can be obtained. In the storage device, the HDMI receiver should reset the parameters of the audio-visual receiving interface circuit according to the determined transmission rate of the fixed-rate link, so as to successfully convert the signal on the fixed-rate link into a signal that the HDMI receiver can parse . Then both ends can transmit and receive data according to this rate information, and one of the audio-visual sources connected to the switched audio-visual receiving interface transmits image data through a fixed-rate link; The information obtains the audio-visual data from the audio-video source connected to the switched audio-video receiving interface, and then, as in step S411, the audio-visual content is played after the audio-video data is decoded.

It is worth mentioning that, in the process shown in Figure 4, in order to save the time spent by the storage device on re-starting the link training with the audio and video source through the hot plug switch when the user switches the HDMI audio and video source to establish a data transmission channel Time, the circuit system for running the method is therefore when the HDMI audio-visual signal line is connected to the audio-visual source and the storage end device, the status and control data channel control module 41 is used to allow the audio-visual source to continuously send the fixed-rate link (FRL) signal until When the user switches to the HDMI audio-visual source, the fixed-rate link audio-visual packet detection module 42 detects the fixed-rate link signal, receives audio-visual data and plays audio-visual content. hotplug switch to restart the link training process.

According to the embodiment of the method for switching the audio-visual receiving interface shown in FIG. 4 , the storage terminal device can save the time of setting up the data transmission channel by allowing the audio-visual source to restart the link training through the hot-plug switch, and how much time is saved depends on the audio-visual How long it takes for the source to restart link training after receiving a hotplug switch.

For the circuit system implementing the method for switching the audio-video receiving interface, please refer to the schematic block diagram of the embodiment shown in FIG. 5 .

The figure shows a storage terminal device 50, which uses the same set of circuits to simultaneously support multiple audio-visual receiving interfaces, such as HDMI interface. The relevant circuit can also be HDMI as an example, and each audio-visual receiving interface is connected to its own processing circuit. The audio-visual interface is shown as the audio-visual receiving interface A (501) and the audio-visual receiving interface B (502). The circuit modules of the detection module 42 are, for example, provided in the circuits of each audio-visual receiving interface with the circuit module 40a and the circuit module 40b respectively. Moreover, the audio-visual receiving interface A (501) and the audio-visual receiving interface B (502) are connected to the audio-visual interface physical layer A (511) and audio-visual interface physical layer B (512) circuits separately, through the switching circuit 521 (such as a multiplexer) device) connected to the circuit of the shared communication protocol layer, such as the audio-visual interface protocol layer 520 shown in the figure. In one embodiment, the audio-visual receiving interface A (501) and the audio-visual receiving interface B (502) are respectively equipped with circuit modules as proposed in the embodiment shown in Figure 4, and are respectively equipped with a status and control data channel control module (Figure 4, 41) and fixed-rate link video and audio packet detection module (Figure 4, 42). Among them, the status and control data channel control module receives the minimum operating current supplied by the power supply circuit (not shown in the figure) in the circuit system, and can still provide audio and video when the storage device closes the audio and video receiving interface (such as turning off the main current) Sources are polled for information. The storage terminal device 50 is connected to different audio-visual sources through audio-visual receiving interface A (501) and audio-visual receiving interface B (502) respectively through audio-visual signal lines 531 and 532, such as the audio-visual source A (51) and audio-visual source B ( 52).

What should be mentioned here is that when the user is playing the video source A (51), the audio/video receiving interface A (501), the audio/video interface physical layer A (511), the switching circuit 521, and the audio/video interface protocol layer 520 must have power. At the same time, other circuits that are not in use, such as the audio-visual interface interface B (502) and the audio-visual interface physical layer B (512), can be powered off. Conversely, when the user switches from audio-visual source A (51) to audio-visual source B (52), the audio-visual interface interface B (502) and the audio-visual interface physical layer B (512) must supply power, and then because the status and control data channel control module The group (Figure 4, 41) has continued to communicate with the video source B (52), so the video source B (52) has sent a fixed rate link (FRL) signal, and then through the fixed rate link video packet detection module (Figure 4, 42) to determine the transmission rate, the parameters of the audio-visual interface interface B (502) and the audio-visual interface physical layer B (512) can be reset to obtain the audio-visual data sent by the audio-visual source B (52).

In this way, the operation of the state and control data channel control module can allow the audio-visual source to continuously send a fixed-rate link signal. For example, when the user plays the audio-visual content of the audio-visual source A, the audio-visual receiving interface B and the physical layer of the audio-visual interface can be closed. B. When the circuit system receives the signal from the user to switch to HDMI video source B, it controls the power supply to the audio-visual receiving interface B and the physical layer of the audio-visual interface B, and then detects the audio-visual packet detection module through the fixed-rate link. Source fixed-rate link signal, and then receive audio-visual data, so that the audio-visual interface protocol layer 520 switches to the audio-visual interface physical layer B through the switching circuit 521, so that the same audio-visual interface protocol layer 520 can be used to receive data from different audio-visual sources. To achieve the purpose of minimizing the circuit design.

The fixed rate link (FRL) training process is implemented in the method for switching audio and video receiving interfaces proposed in the disclosure. The FRL process is applicable to the transmission mode defined in the HDMI 2.1 specification, and the transmitter at the audio and video source end and the receiver at the storage end are in Before entering the FRL mode, link training (link training) must be performed first, and the related process can refer to the flowchart of the embodiment shown in FIG. 6 .

When the storage terminal device is connected to the audio-visual source with the audio-visual signal line, the audio-visual source and the storage terminal device will start the fixed-rate link training program through the status and control data channel (step S601), and at the same time, the audio-visual source and the storage terminal device will pass the status Communicate with the control data channel to establish a handshake procedure (step S603 ).

In the process of link training, the storage device has two checkpoints to determine whether the incoming and outgoing signals are correct. The two checkpoints include a link training pattern packet and a gap pattern (gap pattern) packet. ) packet, that is, in the handshake procedure of the link training procedure between the audio-visual source and the storage terminal device, the audio-visual source specified by the circuit system in the storage terminal device can send some kind of link training graphics as the two ends The purpose of communication; the gap graphic packet is used for comparing the signal quality of the fixed-rate link between the audio-video source and the storage device.

In step S605, the audio-visual source sends a link training pattern packet (LTP packet), and then in step S607, the storage device confirms receipt of the link training pattern packet, thereby judging whether the fixed-rate link signal sent by the audio-visual source is correct At this time, the storage device unconditionally replies to the video source to check the correct (pass) information, so that the link training can complete the process, to confirm the maximum transmission bandwidth between each other, and let the video source continue to send a fixed rate link signal.

Next, as in step S609, before transmitting the image data, the audio-visual source will first transmit gap pattern packets, so that the audio-visual source can prepare the image data within this time, however, the length of time for transmitting the gap pattern packets depends on the audio-visual The time for the source to prepare image data, and in order not to miss the image data, as in step S611, the storage terminal device also unconditionally responds to the gap graphics packet to check the correct information, as in step S613, that is, through link training, thereby maintaining the FRL link status, and wait for the video source to send video data. Finally, in step S615, the audio-video source will output a fixed-rate link signal, and the storage-end device will receive the audio-video data according to the rate information therein, and play the audio-video content accordingly.

To sum up, according to the flow of the method for switching the audio-visual receiving interface described in the above embodiments and the circuit system for executing the method, the circuit system is designed to share the audio-visual interface protocol layer circuit, and is equipped with a status and control data channel control module , which unconditionally makes the link training pattern (LTP) check and the gap pattern (GAP) check correct, so that each audio-visual source continues to send a fixed-rate link signal, which can quickly reflect the audio-visual content that the user wants to play, and then Use the fixed-rate link audio-visual packet detection module to detect the transmission rate of the link signal to reset the HDMI interface and physical layer parameters, obtain audio-visual data accordingly, and start playing the video content. The design of the circuit system can save the protocol layer circuit and the used circuit area, and the multiple video and audio receiving interfaces can connect multiple video and video sources at different fixed rates.

The content disclosed above is only a preferred feasible embodiment of the present invention, and does not therefore limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made by using the description and drawings of the present invention are included in the application of the present invention. within the scope of the patent.

10: Accumulation end device 101, 102, 103: power domain 111: HDMI port A 112: HDMI port B 113: display port 121, 122, 123: AV signal line 11: Audio and video source A 12: Video source B 13: Audio and video source C 30: storage end device 301: HDMI port A 302: HDMI port B 311:HDMI physical layer A 312:HDMI physical layer B 321:HDMI protocol layer A 322:HDMI protocol layer B 331, 332: AV signal line 31: Audio and video source A 32: Video source B 41: Status and control data channel control module 42: Fixed rate link video and audio packet detection module 40: Circuit module 50: Storage end device 501: Audio and video receiving interface A 502: Video and audio receiving interface B 511: audio-visual interface physical layer A 512: audio-visual interface physical layer B 520: AV interface protocol layer 521: switching circuit 531, 532: AV signal line 51: Video source A 52: Video source B Steps S201-S215: know the process of switching the image receiving interface to establish an audio-visual connection Steps S401-S411: The present invention switches the image receiving interface to establish a video-audio connection process Steps S601-S615: fixed-rate link training process

FIG. 1 shows a schematic diagram of a conventional display adopting a high-definition multimedia interface and a display port;

FIG. 2 shows a conventional flow chart of switching the image receiving interface to establish an audio-visual connection;

FIG. 3 shows a schematic diagram of a circuit structure of a conventional display adopting a high-definition multimedia interface;

Fig. 4 shows the flow chart of an embodiment of the method for switching audio-visual receiving interface;

Figure 5 shows a schematic block diagram of an embodiment of a circuit system implementing a method for switching an audio-visual receiving interface; and

Fig. 6 shows a flowchart of an embodiment of fixed-rate link training.

41: Status and control data channel control module

42: Fixed rate link video and audio packet detection module

40: Circuit module

S401: Establish connections between each audio-video receiving interface and audio-video sources

S403: The user wants to play video and audio content from a certain source

S405: Through the SCDC control module, the storage device and the audio-visual source complete link training, and continuously respond to the polling of the audio-visual source, so that the audio-visual source continues to send FRL signals

S407: switch audio and video receiving interface

S409: Detect the FRL signal through the FRL audio and video packet detection module, and analyze the audio and video packets

S411: start playing video and audio content

Claims (10)

A method for switching an audio-visual receiving interface, implemented in a circuit system, comprising: When multiple audio-visual sources are connected to multiple audio-visual receiving interfaces in a storage terminal device, a state and control data channel control module in the circuit system continuously responds to the status and information sent by the corresponding audio-visual source to the storage terminal device. Control data channel communication requirements; continuing to send fixed-rate link signals from the plurality of audio-visual sources according to the continuous response of the status and control data path control module; and When the storage device switches to one of the audio-visual receiving interfaces, a fixed-rate link video-audio packet detection module in the circuit system starts to detect the output from one of the audio-visual sources corresponding to the switched audio-visual receiving interface. The fixed-rate link signal establishes a fixed-rate link with the switched audio-visual receiving interface, so that the storage device obtains audio-visual data from one of the audio-visual sources connected to the audio-visual receiving interface according to a rate information. The method for switching audio-visual receiving interfaces as described in claim item 1, wherein, when the storage terminal device is switched to one of the audio-visual receiving interfaces, other audio-visual sources that are not being played continue through the status and control data channel control module Respond to the status and control data channel communication requirements sent by each audio-visual source, so that each audio-visual source can continuously send a fixed-rate link signal according to the continuous response of the storage terminal device, so that the storage terminal device and each audio-visual source complete the link train. The method for switching an audio-visual receiving interface as described in claim 1, wherein when the fixed-rate link signal sent by one of the audio-visual sources corresponding to the switched audio-visual receiving interface is started to be detected, the audio-visual packet is analyzed to obtain the A transmission rate of video and audio data. The method for switching an audio-visual receiving interface as described in claim 3, wherein, after obtaining the transmission rate, reset the parameters of an audio-visual interface interface and an audio-visual interface physical layer in the storage device to pass through a fixed rate link way to obtain the audio-visual data. The method for switching an audio-visual receiving interface as described in any one of claim items 1 to 4, wherein the information continuously obtained by the plurality of audio-visual sources through the corresponding state and control data channel control module includes that the storage terminal device is in the state One or more checkpoints set in the Control Data Channel Control Module. The method for switching video and audio receiving interfaces as described in Claim 5, wherein the checkpoint includes a link training graphic packet and a gap graphic packet. The method for switching video and audio receiving interfaces as described in claim item 5, wherein the storage terminal device unconditionally replies with the correct information of the multiple video and video sources, so that the link training can complete the process and allow the multiple video and video sources to continue sending Fixed rate link signal. A circuit system applied to a storage device, comprising: A status and control data channel control module communicates with the corresponding video and audio source through a status and control data channel, and provides the corresponding video and video source to poll the information, so that the multiple video and video sources can determine the storage terminal device The corresponding multiple audio-visual receiving interfaces are in continuous operation; A fixed-rate link audio-visual packet detection module, which rebuilds a fixed-rate link through signal detection, fixed-rate link transmission rate judgment, and fixed-rate link packet judgment; Wherein the circuit system executes a method for switching an audio-visual receiving interface, including: When multiple audio-visual sources are connected to multiple audio-visual receiving interfaces in the storage terminal device, the control module continuously responds to the status and control data channel communication request sent by the corresponding audio-visual source to the storage terminal device through the status and control data channel ; Continuously responding from the plurality of video and audio sources according to the corresponding status and control data channel control module to continuously send fixed-rate link signals; and When the storage device is switched to one of the audio-visual receiving interfaces, the fixed-rate link video packet detection module detects the fixed-rate link signal sent by one of the audio-visual sources corresponding to the switched audio-visual receiving interface , and analyze a transmission rate to establish the fixed-rate link with the switched audio-visual receiving interface, so that the storage device obtains audio-visual from one of the audio-visual sources connected to the audio-visual receiving interface according to the transmission rate data. The circuit system according to claim 8, wherein the plurality of audio-visual receiving interfaces share the protocol layer of the audio-visual interface through a switching circuit in addition to being connected to a physical layer of the audio-visual interface. The circuit system as described in claim 9, wherein the audio-visual interface physical layer corresponding to the switched audio-visual receiving interface, the switching circuit and the shared audio-visual interface protocol layer must have power, and the remaining audio-visual receiving interfaces that are not in use and The physical layer of the audio-visual interface turns off the power supply.

Images